Senior​/Principal Back-End and Front-End Engineers On-Site – j

Senior/Staff/Principal Back-End and Front-End Engineers – New York – On-Site – Opportunity to join one of the Fastest-Growing and Well-Known Fin-Tech Start-Ups in NYC

This young and agile company, building a cutting-edge commerce network is currently seeking Back End and Front-End Engineers of all levels with start-up experience.

You will assist with the continuous expansion and optimization of their services in a frontier space.

This is an excellent opportunity for an experienced Software Engineer with start-up experience to take the next step into a challenging position with a company offering significant growth potential.

• Valued at over $10bn having raised over $250m in their Series B funding in 2025.
• Launched in the 2020’s, this is phenomenal growth
• Their network has already reached more than 4.5 million people
• They have already acquired some smaller Fintechs
• They launched their new product in 2026

Back-End:

In addition to coaching and mentoring junior resources and working with other team members and stakeholders, your duties will include designing, deploying, and documenting the back-end services for the website and mobile app.

Additionally, you will promote best practices, guarantee that integrations are technically feasible, and optimise the application for optimal speed, scalability, and dependability.

• Investigate and utilize Google Cloud Platform services to continuously improve application architecture
• Implement microservices using Java and Quarkus framework
• Propose and enhance automation initiatives related to infrastructure as code, CI/CD, monitoring and alerting
• Contribute to all phases of the development lifecycle
• Write well-designed, testable, and efficient code
• Become a foundational member of our team, working alongside the Head of Engineering and Head of Product

Front-End:

In order to develop user-facing features, you will work directly with the frontend engineering and product teams across the React Native mobile app.

• Write well designed, testable, efficient code
• Identify opportunities to refactor and make features more robust
• Coordinate with QA to test new features
• Be responsible for writing unit and integration tests
• Work together with the backend team to come up with requirements for an API

Back-End:

• Java
• GCP and/or AWS or Azure, Distributed Systems focus
• 6+ Years of Experience
• Start-Up Experience

Front-End:

• 6+ years of React experience
• 3+ years of React Native experience
• Proven experience in React Native, Type Script/JavaScript, Redux/Global state management frameworks
• Strong UX design skills, problem solving, and troubleshooting skills.
• Understanding of how to optimize the delivery of code and assets to a browser or device
• Ability to articulate the benefits and challenges of depending on front-end libraries, frameworks, and tool-sets
• Ability to write testable code
• Start-Up Experience - nice to have

Roles like these are snapped up very quickly, so act now if you do not want to miss out! Reply to this advert or email your CV to